I have enjoyed John Wundes's script "Vary Hues" for quite some time to create random colors in a group. Thank you John!
But when John said "Hue" it was not precisely the "Hue" in "HSB color". He meant more generally "the color". So he's calculating the random range in [Red, Green, Blue], or [Cyan, Magenta, Yellow, Black].

Now I thought I want to have better control over the actual "Hue", "Saturation" and "Brightness". Also I want to add the randomness in size and opacity. So here's the Variator:

This is the combination of varying the Fill Color, Size and Opacity at the same time.

To test this script and see it in real-life use case, I created this illustration

Except for the obvious hexagons, I also benefited a lot from the Variator while creating the glitters on her lips and eyelids, as well as the earrings.